1721 HMS Seahorse infected with smallpox arrives in Boston harbor, causing the first outbreak in two decades. - half of the population catch it, causing 850 deaths.
1915 First military use of poison gas occurs when Germany uses chlorine gas against the Allies at Ypres in World War I
1916 Chief of Staff of the Irish Volunteers Eóin MacNeill issues the Countermanding order in Dublin to try to stop what would become the Easter Rising.
1940 Rear Admiral Joseph Taussig testifies before US Senate Naval Affairs Committee that war with Japan is inevitable.
1945 Battle of Berlin: Upon being informed that a planned counter-attack never happened, Adolf Hitler flies into a rage, denounces the German Army and concedes World War II is lost.
1945 SS chief Heinrich Himmler secretly meets with Count Folke Bernadotte of Sweden, asking him to act as an intermediary for a surrender offer to the Western Allies. The Allies do not take the offer seriously.
2016 Paris Agreement on climate change signed in New York binding 195 nations to an increase in the global average temperature to less than 2°C above pre-industrial levels and to pursue efforts to limit the increase to 1.5°C
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